JP2000048403A - Information recording medium and manufacture of information recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an information recording medium with which the manufacturing efficiency of the information recording medium is improved and defect in manufacture of the information recording medium is eliminated by efficiently adhering a first substrate to a second substrate with an adhesive. SOLUTION: The information recording medium is provided with a disk-like first substrate D1, which has a first center hole 120A and an information recording part formed in the surrounding of the first center hole 120A, and a disk-like second substrate D2, which has a second center hole 120B and a information recording part formed in the surrounding of the second center hole 120B and is stuck together while rotated together with the first substrate D1 by mating the position of the second center hole 120B with that of the first center hole 120A and by the use of the adhesive 110. Adhesive-flowing out baffling parts 400 for preventing the adhesive 110 from flowing out on the first center hole 120A and second center hole 120B sides are provided in the vicinity of the first center hole 120A of the first substrate D1 and the second center hole 120B of the second substrate D2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information recording medium formed by bonding a first substrate and a second substrate, and a method for manufacturing the information recording medium.

[0002]

2. Description of the Related Art As a next-generation high-quality video recording system, for example, a technology using a high-capacity high-density multimedia disk for information recording has been proposed, and this is a so-called digital video disk (DVD). Can be used as An information recording section of a high-density multimedia disk (for example, a high-density multimedia CD) stores approximately 4.7 gigabytes of digital data in a read-only disk having a diameter of, for example, 12 cm, which is more than five times that of a current CD (compact disk: 650 megabytes). Can be recorded on one side. Further, by providing a two-layer information recording unit on one side of the substrate, the storage capacity is approximately doubled.

[0003] When producing such a high-density information recording medium, a disc-shaped first substrate having an information recording section is provided;
Another second substrate having an information recording unit is bonded using a photocurable resin. The first substrate and the second substrate have a thickness of, for example, 0.6 mm. When such a first substrate and a second substrate are bonded to each other, an ultraviolet curable resin (UV resin,
(Liquid) using a spinner method. In the case of using the spinner method, in order to prevent bubbles from being contained in the adhesive, an amount of the ultraviolet curable resin exceeding an amount necessary for adhesion is used for the first.
The first substrate and the second substrate are dropped onto the substrate or the second substrate, and a spinning process is performed until the adhesive has a predetermined thickness.

In the range of adhesion between the first substrate and the second substrate, it is preferable that the adhesive is uniformly applied to the entire surface of the first substrate and the second substrate, but the edge of the center hole between the first substrate and the second substrate is preferably used. If you try to apply the adhesive up to this point, a part of the adhesive will often protrude into the center hole.To prevent this adhesive from protruding, keep a certain distance from the inner peripheral edge forming the center hole. To determine the bonding range. As described above, even if the bonding range is set in advance so as to be away from the edge of the center hole, the behavior of the adhesive is not constant, and the adhesive may flow out and protrude into the center hole.

[0005]

As a result, the circular inner peripheral edges of the center holes of the first substrate and the second substrate become indefinite or become dirty, resulting in a defective product.
In addition, a bonding apparatus for bonding the first substrate and the second substrate is contaminated with an adhesive, and if the subsequent operation does not remove the contaminant from the adhesive, defective products will be continuously manufactured, or A defective product is manufactured due to unstable operation. In order to prevent the adhesive from protruding into the center hole, when the adhesive is dropped in the outer peripheral direction of the first substrate and the second substrate, it waits for the adhesive to spread in the inner peripheral direction, and then proceeds to the next operation. Therefore, it takes a long time to bond the first substrate and the second substrate. In addition, even if this is done, the phenomenon that the adhesive protrudes into the center hole is not completely eliminated. Therefore, the present invention solves the above-mentioned problems, and can improve the manufacturing efficiency of the information recording medium by efficiently bonding the first substrate and the second substrate with an adhesive, and eliminate the manufacturing defect of the information recording medium. It is an object of the present invention to provide an information recording medium and a method for manufacturing the information recording medium, which can perform the following.

[0006]

According to the present invention, there is provided a disk-shaped first substrate having a first center hole and an information recording portion formed around the first center hole. It has an information recording portion formed around the center hole and the second center hole, and rotates with the first substrate using an adhesive while aligning the positions of the second center hole and the first center hole of the first substrate. A second substrate in the form of a disc to be bonded, and an adhesive is applied to the first center hole of the first substrate and the second center hole of the second substrate in the vicinity of the first center hole and the second center hole. The adhesive outflow barrier to prevent it from flowing out,
By the information recording medium characterized by being provided,
Achieved.

In the information recording medium of the present invention, the first substrate has a first center hole and an information recording portion formed around the first center hole. The second substrate has a second center hole and an information recording portion formed around the second center hole. The second substrate and the first substrate are located at the positions of the second center hole and the first center hole. Are bonded together while rotating using an adhesive. An adhesive outflow barrier is provided near the first center hole of the first substrate and the second center hole of the second substrate. This adhesive outflow barrier portion is for preventing the adhesive from flowing toward the first center hole and the second center hole.

In this manner, the adhesive is disposed on the outer periphery of the first substrate and the second substrate near the adhesive outflow barrier portion,
By rotating while bonding the first substrate and the second substrate, the adhesive is quickly and uniformly spread within a predetermined bonding range between the first substrate and the second substrate, and the first substrate and the second substrate are formed at a predetermined thickness. Moreover, they can be bonded in a short time. That is, it is possible to prevent the adhesive outflow barrier portion from flowing out toward the first center hole and the second center hole. By doing so, the defect of the obtained information recording medium is eliminated.
In addition, since the adhesive does not flow out at the time of bonding, the device for manufacturing the information recording medium can be prevented from being stained, cleaning and the like can be eliminated, and the operation rate of the device can be improved. The application range of the adhesive becomes constant, the adhesive effect is stabilized, and the appearance of the information recording medium does not vary.

In the present invention, preferably, the adhesive outflow barrier portion is formed of a photocurable resin, and the barrier height of the adhesive outflow barrier portion is determined by a predetermined adhesive height when the information recording medium is obtained. It is set within the thickness. This allows
The barrier height of the adhesive outflow barrier does not hinder the setting of the adhesive thickness, and the adhesive thickness can be reliably set.

In the present invention, the adhesive outflow barrier is preferably formed of a substance having low wettability to the adhesive.

According to the present invention, there is provided a disk-shaped first substrate having a first center hole and an information recording portion formed around the first center hole, a second center hole and a second center hole. The adhesive is prevented from flowing toward the first center hole and the second center hole near the first center hole and the second center hole in the disk-shaped second substrate having the information recording portion formed around the hole. Forming an adhesive outflow barrier portion for forming an adhesive outflow barrier portion, and aligning the first center hole and the second center hole with the first substrate and the second substrate while rotating using an adhesive. This is achieved by a method of manufacturing an information recording medium, comprising: a bonding step of bonding.

In the method of manufacturing an information recording medium according to the present invention, in the step of forming the adhesive outflow barrier portion, the first substrate is provided with the first substrate.
An adhesive outflow barrier is formed near the center hole and the second center hole of the second substrate so that the adhesive does not flow toward the first center hole and the second center hole. In the bonding step, the first substrate and the second substrate are
The first center hole and the second center hole can be aligned with each other while rotating using an adhesive. By doing so, the adhesive is applied to the first substrate and the second substrate.
By arranging the substrate on the outer peripheral side near the adhesive outflow barrier portion and rotating while bonding the first substrate and the second substrate,
The adhesive can be quickly and uniformly spread within a predetermined bonding range between the first substrate and the second substrate, and the first substrate and the second substrate can be bonded with a predetermined thickness in a short time. That is, it is possible to prevent the adhesive outflow barrier portion from flowing out toward the first center hole and the second center hole. By doing so, the defect of the obtained information recording medium is eliminated. In addition, since the adhesive does not flow out at the time of bonding, the device for manufacturing the information recording medium can be prevented from being stained, cleaning and the like can be eliminated, and the operation rate of the device can be improved. The application range of the adhesive becomes constant, the adhesive effect is stabilized, and the appearance of the information recording medium does not vary.

[0013] In the present invention, preferably, the adhesive outflow barrier portion is formed of a photocurable resin, and the barrier height of the adhesive outflow barrier portion is set at a predetermined value when the information recording medium is obtained. It is set within the thickness. This allows
The barrier height of the adhesive outflow barrier does not hinder the setting of the adhesive thickness, and the adhesive thickness can be reliably set.

In the present invention, preferably, the adhesive outflow barrier portion is formed near the first center hole of the first substrate and the second barrier hole is formed near the second center hole of the second substrate. It is composed of a second barrier section.

In the present invention, preferably, the first barrier portion and the second barrier portion each have a projection and an air release portion between the projections. As a result, air can escape from the air escape portion between the protrusions, so that air cannot be trapped between the adhesive and the end of the protrusion, and the adhesive reliably reaches the end of the protrusion. I do. From this, a predetermined bonding range can be secured.

In the present invention, preferably, the adhesive outflow barrier is made of a photocurable resin applied by a screen printing method.

In the present invention, preferably, the adhesive outflow barrier portion is made of a photocurable resin dropped by a nozzle.

In the present invention, preferably, the adhesive outflow barrier portion is formed of a substance having low wettability to the adhesive.

In the present invention, the adhesive outflow barrier is preferably water or oil.

[0020]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. Note that the embodiments described below are preferred specific examples of the present invention,
Although various technically preferable limits are given, the scope of the present invention is not limited to these modes unless otherwise specified in the following description.

FIG. 1 shows an example of an apparatus for manufacturing an information recording medium for manufacturing a preferred embodiment of the information recording medium of the present invention, and FIG. 3 shows an example of the structure of the aligner 30. The information recording medium manufacturing apparatus 10 is generally a first substrate molding machine 1.
2. Second substrate molding machine 14, Al reflection film sputtering unit 1
6, a semi-transmissive film sputtering unit 18, a protective film applying unit 20, a protective film applying unit 22, a bonding machine 30, and the like. FIG. 3 shows an example of a disc-shaped information recording medium manufactured by the information recording medium manufacturing apparatus 10 shown in FIG.
The disc-shaped information recording medium 100 shown in FIG. 3 includes a first substrate (upper disk) D1 and a second substrate (lower disk) D1.
2 and UV-curable resin as adhesive (photo-curable resin)
110. In the center of such a disc-shaped information recording medium 100, a center hole 120 is provided.
A, 120B.

The first substrate D1 has a thickness L, and the second substrate D2 similarly has a thickness L. This thickness L is, for example, 0.6 mm. The first substrate D1 is made of a translucent material, for example, polycarbonate, and the second substrate D2 is also made of polycarbonate. Pits are formed on one surface of the first substrate D1, and have an Al reflective film 140 and a protective film 130.
The portion of the Al reflective film 140 and the protective film 130 constitutes an information recording section. Similarly, pits are formed on one surface of the second substrate D2, and the semi-transmissive film 160 and the protective film 15 are formed.
It has 0. The semi-permeable film 160 and the protective film 150
Form the information recording portion of the second substrate D2.

The pits or grooves of the information recording portion of the first substrate D1 of FIG. 3 are formed by the forming machine 12 of the first substrate D1 of FIG. Similarly, the pits or grooves of the information recording portion of the second substrate D2 are formed by the forming machine 14 of the second substrate D2.

The Al reflection film sputtering unit 16 shown in FIG.
Is formed. The protection film application unit 20 forms the protection film 130. The semi-permeable film sputtering unit 18 of FIG.
Forms the semi-transmissive film 160 of the second substrate D2 in FIG. 3, and forms the protective film 150 in the protective film application unit 22. The bonding machine 30 sets the predetermined DL by bonding the first substrate D1 and the second substrate D2 manufactured as described above with the ultraviolet curing resin 110 used as an adhesive.

Next, an example of the structure of the bonding machine 30 shown in FIG. 1 will be described with reference to FIG. Laminating machine 3
Reference numeral 0 denotes a substrate holding unit 40, a thickness checker 44, a setter 46, an ultraviolet irradiation device (light irradiation device) 48, a controller 50, and the like. The substrate holding means 40 holds the first substrate D1 and the second substrate D2 integrally and rotates them continuously. As shown in FIG. 2, the substrate holding means 40 has a turntable 51, a centering pin 52, and a motor 53 for the turntable. The motor 53 can rotate the turntable 51 and the centering pin 52 continuously and integrally in the R direction according to a command from the controller 50.

The centering pin 52 is provided between the first and second center holes 120A, 120A of the second substrate D2 and the first substrate D1.
0B so that both can be centered. A second substrate D2, which is a lower disk, is directly mounted on the turntable 51.

A thickness checker 44 as a thickness detecting means shown in FIG. 2 is used for bonding a disc-shaped information recording medium 100 composed of a first substrate D1 and a second substrate D2 to be bonded by an ultraviolet curing resin (adhesive) 110. The thickness of the agent 110 is detected. The thickness information of the adhesive 110 detected by the thickness checker 44 is supplied to the controller 50.
The setter 46 holds the first substrate D1, fits into the centering pins 52, contacts the adhesive 110 so as not to embrace bubbles, and then releases the first substrate D1.

The ultraviolet irradiation device (light irradiation device) 48 irradiates the ultraviolet curing resin 110 disposed between the first substrate D1 and the second substrate D2 with ultraviolet light,
The ultraviolet curing resin 110 is light-cured. This ultraviolet irradiation device 48 can be moved by means (not shown) in the direction E, that is, in the radial direction of the first substrate D1 and the second substrate D2, for example, from the outer periphery to the inner periphery. The timing of irradiating this ultraviolet ray is determined by the adhesive 11
Irradiation is performed after the checker 44 detects that 0 has become the thickness BW. In this case, the turntable 51 is
Since the substrate D <b> 1 and the second substrate D <b> 2 are continuously rotated in the R direction, the ultraviolet irradiation device 48 can irradiate the entirety of the ultraviolet curable resin 110 with ultraviolet.

The controller 50 is electrically connected to the turntable motor 53 and the setter 46.
These actuation targets are controlled based on an operation sequence described later.

The bonding machine 30 shown in FIG. 2 uses the center hole 1 for the first substrate D1 and the second substrate D2 as described above.
By adjusting the positions of 20A and 120B, they can be bonded and bonded via the adhesive 110.

Next, the characteristic structure of the first substrate D1 and the second substrate D2 will be described with reference to FIGS.
FIGS. 4 and 5 show the first substrates D1 and D2 described above, and the first substrate D1 and the second substrate D2 have center holes 120A and 120B, respectively. As shown in FIG. 4, an adhesive outflow barrier portion 400 is formed around the center hole 120A of the first substrate D1 and around the center hole 120B of the second substrate D2. 4 and 5, the adhesive outflow barrier 400 is
It is composed of a protrusion 401 and an air escape portion 402 formed between the protrusions 401, 401. Protrusion 40
Numeral 1 is a substantially quarter-circumferential projection, and the air escape portion 402 is formed between the projections 401, 401, and allows air to escape to the center hole side.

As shown in FIGS. 6 and 8, the adhesive 110 is disposed between the first substrate D1 and the second substrate D2, and after the second substrate D2 comes into contact with the adhesive 110 as shown in FIG. , The setter 46 releases the second substrate D2. Due to the weight of the second substrate D2 and the spreading effect of the adhesive itself, the adhesive 110
It spreads in the directions of X1 and X2 between the substrate D1 and the second substrate D2. In FIG. 3, a predetermined thickness B of the adhesive 110 when the information recording medium 100 is completed is set.
W, the protrusion 40 of the adhesive outflow barrier 400
One thickness G is set to, for example, BW / 2 or less. The value of the thickness G is set in the first substrate D
The projection 401 of the first substrate D and the projection 401 of the second substrate D2 are overlapped so as to face each other. At this time, BW / 2 + B
This is because it is necessary to set W / 2 = BW or less. Otherwise, the thickness BW of the adhesive 110
However, the thickness of the information recording medium 100 is erroneously set because the thickness of the protrusions 401, 401 is disturbed and cannot be set to the predetermined thickness BW.

As shown in FIGS. 6 and 7, while the adhesive outflow barrier portion 400 is arranged in a substantially circular shape, it is further outward, that is, the center hole 120A (120).
It is desirable that the adhesive 110 is applied in a ring shape on the side remote from B). As shown in FIGS. 8 and 9, the adhesive 110 applied in such a manner is, as shown in FIGS. 8 and 9, the weight of the second substrate D2 and the spread of the adhesive 110 itself. The air escapes to the air escape section 402. However, the adhesive 110 is blocked by the protrusion 401, and the adhesive 110 is
Alternatively, it does not reach 120A. Since the air escape portions 402 are formed, for example, approximately every 90 degrees, the adhesive 110 surely reaches the end surface 401A of the protrusion 401 as shown in FIG. Otherwise, when the air escape portion 402 is not formed, as shown in FIG.
01 without reaching the end face 401A.
Since 3 is formed, the spread of the adhesive 110 is deteriorated. From this, the adhesive 1 is adjusted to a preset range.
10 does not spread sufficiently.

Next, using an information recording medium manufacturing apparatus,
An example of a method for manufacturing an information recording medium will be described.
The forming machine 12 for the first substrate D1 shown in FIG. 1 forms the first substrate D1, and the forming machine 14 for the second substrate D2 forms the second substrate D2. On the first substrate D1, the Al reflective film sputtering unit 16 forms the reflective film 140 as shown in FIG. 3 and, if necessary, the protective film coating unit 20
A protective film 130 as shown in FIG. 3 is formed. The semi-permeable film sputtering unit 18 of FIG. 1 forms the semi-permeable film 160 of the second substrate D2 of FIG.
0 is formed by the protective film application unit 22 in FIG.

The bonding machine 30 shown in FIG. 2 uses the adhesive 110 with the first substrate D1 and the second substrate D2 thus obtained.
Glue using In this case, as shown in FIGS. 4 and 5, an adhesive outflow barrier 400 is formed in advance on the first and second substrates D1 and D2. The protrusion 401 of the adhesive outflow barrier portion 400 is formed in the center hole 120A.
Alternatively, it is formed in a substantially ring shape near the outer side of 120B. Projection 401 of this adhesive outflow barrier 400
For example, a photocurable resin, particularly an ultraviolet curable resin is used. The shape of the protrusion 401 and the shape of the air escape portion 402 of the adhesive outflow barrier portion 400 are determined by dropping an ultraviolet curable resin 110 as an adhesive as shown in FIG.
After stacking the second substrate D2 as described above, the type (mainly viscosity) of the adhesive can be selected so that the second substrate D2 can reach the adhesive outflow barrier portion 400 quickly.

FIGS. 13 (A), (B), (C) and FIG.
(D) and (E) show examples of the screen printing method for forming the adhesive outflow barrier section 400. FIG.
In (A), the ultraviolet curable resin (UV resin) 401A is
It is on the screen 111. This screen 111
Is supported by a screen printing frame 112, and the squeegee 113 moves while pressing the ultraviolet curable resin 401A on the screen 111 in the direction of arrow H as shown in FIG. The ultraviolet curing resin 401A is printed on the first substrate D1 or the second substrate D2. When the processing by the squeegee 113 is completed as shown in FIG.
As shown in FIG. 5, an ultraviolet curable resin 401A is formed at a predetermined position on the first substrate D1 or the second substrate D2 by screen printing in a pattern as shown in FIGS.

Then, as shown in FIG. 14D, the ultraviolet curing resin 401A is ultraviolet-cured by ultraviolet rays 116 from an ultraviolet curing lamp 115 for ultraviolet curing. For this reason, the protrusion 401 and the air release portion 402 of the adhesive outflow barrier portion 400 as shown in FIG. 14 (E) and FIGS. 4 and 5 can be formed. As described above, the adhesive outflow barrier portion 400 is formed on the first substrate D1 and the second substrate D2.

Next, the first substrate D1 having the adhesive outflow barrier portion 400 is placed on the turntable 51 of the substrate holding means 40 shown in FIG. In this case, the adhesive outflow barrier portion 40
0 is located on the upper surface side of the first substrate D1. Then, as shown in FIG. 10A, an ultraviolet curable resin 110 as an adhesive is dropped on the first substrate D1. The position at which the adhesive 110 is dropped is the protrusion 40 of the adhesive outflow barrier 400.
1 and outside. That is, between the center hole 120B and the ultraviolet curable resin 110, the protrusion 40
1 is located.

In FIG. 2, the second substrate D2 is replaced with the first substrate D
1 are superimposed via an adhesive 110. At this time, the center holes 120B and 120A are aligned by the spindle 52 of the turntable. Accordingly, the protrusion 401 of the adhesive outflow barrier portion 400 of the first substrate D1 is connected to the adhesive outflow barrier portion 400 of the second substrate D2.
Is positioned at a position facing the protrusion 401. However, the air release portions 40 of the first substrate D1 and the second substrate D2
The two positions may not be angularly identical.

Next, the weight of the first substrate D1 is spread by the adhesive itself, so that the ultraviolet curable resin 110 spreads in the X1 direction and the X2 direction as shown in FIGS. The ultraviolet curing resin 110 spreads in the directions of X1 and X2, and FIG.
As shown in FIG. 1, when the ultraviolet curable resin 110 reaches the end surface 401A of the protrusion 401, the controller 50 of FIG. 2 operates the motor 53 to rotate the turntable 51, so that the ultraviolet curable resin 110 While spreading in the circumferential direction between the substrate D1 and the second substrate D2, the total thickness DL of the information recording medium 100 is constant, that is, the thickness of the ultraviolet curable resin 110 is constant in the radial direction. Spinning processing is performed. When the spinning process by the rotation of the turntable 51 is completed, a curing process of the ultraviolet curing resin 110 is performed next. That is, the ultraviolet irradiation device 48 moves in the E direction, thereby curing the adhesive 110 spread in the radial direction with ultraviolet light. As described above, the first substrate D1 and the second substrate
The substrate D2 can be reliably integrated with the ultraviolet curing resin 110 at a predetermined thickness.

While the ultraviolet curable resin 110 is temporarily dammed at the protruding portion 401, the spinning process is performed as described above, so that the ultraviolet curable resin 110 is removed.
Does not enter the inside from the protrusion 401, that is, the adhesive 110 does not flow out toward the center holes 120A and 120B. Thereby, the ultraviolet curable resin 110
Protrudes from the center halls 120A and 120B,
The turntable 51 and other parts are not contaminated with the ultraviolet curable resin, and there is no need to perform such treatment of the ultraviolet curable resin that has flowed out. Moreover, since the ultraviolet curable resin 110 has reached the protrusion 401 of the adhesive outflow barrier portion 400, a constant adhesive range can be always maintained.
The bonding effect between the substrate and the second substrates D1 and D2 can be stably exhibited.

FIGS. 15 and 16 show another embodiment of the method for manufacturing an information recording medium according to the present invention. FIG. 15 and FIG.
In the sixth embodiment, the adhesive outflow barrier section 500 is formed by dripping with the nozzle 501. The nozzle 501 forms the adhesive outflow barrier portion 500 by supplying, for example, an ultraviolet curable resin. The adhesive outflow barrier section 500 is configured such that a plurality of circular or spherical projections 502 are formed at equal intervals. That is, these protrusions 502 are arranged in a circular shape at intervals along the periphery of the center hole 120A or 120B. Therefore, the projections 502, 5
An interval portion 02 is an air escape portion 503.

If the number of nozzles 501 is one, the first
By indexing the substrate D1 or the second substrate D2 in the R direction, a plurality of protrusions 502 can be formed at equal intervals. On the other hand, if the number of nozzles 501 is provided corresponding to the number of protrusions 502, the protrusions 502 can be formed by a plurality of nozzles 501 at once without rotating the first substrate D1 or the second substrate D2. can do. The number and size of the protrusions 502 can be set according to the type of the ultraviolet curing resin or the type of the adhesive used.

FIGS. 17 and 18 show still another embodiment of the method for manufacturing an information recording medium according to the present invention. First
An adhesive outflow barrier 800 as shown in FIG. 18 is formed using a stamp 700 on the bonding surface side of the substrate or the second substrates D1 and D2. That is, stamp 7
00, a material M having poor or low wettability with respect to an adhesive such as oil is applied from the stamp table 701 to the stamp 7.
00, the stamp 700 is provided on the center hole 120A or 12A of the first substrate D1 or the second substrate D2.
An adhesive outflow barrier portion 800 is formed around the periphery of OB as shown in FIG. The stamp 700 is a process S
After the substance M having poor wettability of the stamp base 701 is attached along the stamp 1, the stamp 702 moves along the step S2, and the stamp 700 is bonded to the first substrate D1 or the second substrate D2 as in the step S3. Facing the surface 900. Then, the stamp 700 is attached to the bonding surface 900 along the step S3.
A substance M having poor wettability is attached thereto. Stamp 7
00 returns to the stamp table 701 side again according to step S4. Thereby, the substance M such as oils having poor wettability is
An adhesive outflow barrier 800 is formed as shown in FIG. The adhesive outflow barrier section 800 has a substance forming section 801 and an air escape section 802. By using the substance M having poor wettability with respect to the ultraviolet curing resin as an adhesive,
The adhesive outflow barrier portion 800 can exhibit the same function as the adhesive outflow barrier portion 400 as shown in FIGS.

When a bonding structure is adopted for an optical disk or the like, a protrusion having a thickness less than the adhesive thickness specified by the standard and an air release portion are provided on the disk around the center hole of the disk, or Apply a material with poor wettability at intervals, spread the adhesive quickly to the specified position, and do not flow out into the center hole. Therefore, the defect of the disk in which the adhesive is protruded into the center hole is eliminated.
In addition, since the adhesive sticks out into the center hole, dirt of the bonding device and trouble of cleaning the bonding device are eliminated, and the operation rate of the device is improved. The coating range of the adhesive is constant, the bonding effect is stable, and the appearance of the disc does not vary.

The present invention is not limited to the above embodiment. In the embodiment of the present invention, a photocurable resin, most preferably an ultraviolet curable resin, is preferably used as the adhesive, but other types of adhesives may be used. The adhesive outflow barrier uses a photocurable resin, most preferably an ultraviolet curable resin, or a material having poor wettability to the adhesive such as oils. The oils include, for example, silicon grease. The structural examples of the first substrate and the second substrate are not limited to the illustrated examples, and other types of structures may be employed.

[0047]

As described above, according to the present invention,
By efficiently adhering the first substrate and the second substrate with an adhesive, the production efficiency of the information recording medium can be increased, and the production failure of the information recording medium can be eliminated.

[Brief description of the drawings]

FIG. 1 is a diagram showing an example of an apparatus for carrying out a method for manufacturing an information recording medium according to the present invention.

FIG. 2 is a diagram illustrating an example of a bonding machine of the manufacturing apparatus of FIG. 1;

FIG. 3 is a diagram showing an example of the structure of an information recording medium to be obtained by bonding.

FIG. 4 is a diagram showing an example of an adhesive outflow barrier formed on a first substrate and a second substrate of an information recording medium.

FIG. 5 is a side view of a first substrate and a second substrate having an adhesive outflow barrier portion.

FIG. 6 is a diagram illustrating an example of an adhesive and an adhesive outflow barrier disposed between a first substrate and a second substrate.

FIG. 7 is a plan view showing an example of an adhesive outflow barrier portion.

FIG. 8 is a view showing a state in which an adhesive is spread by being pushed by a first substrate and a second substrate.

FIG. 9 is a plan view showing how the adhesive in FIG. 8 spreads.

FIG. 10 is a diagram illustrating a state where an adhesive is dropped on a second substrate.

FIG. 11 is a view showing a state in which an adhesive sandwiched between a first substrate and a second substrate has moved to an adhesive outflow barrier side;

FIG. 12 is a view showing the behavior of the adhesive when the adhesive outflow barrier has no air escape portion.

FIG. 13 is a view showing a state in which an adhesive outflow barrier portion is formed by a screen printing method.

FIG. 14 is a diagram showing a state in which an adhesive outflow barrier portion is formed by a screen printing method.

FIG. 15 is a diagram illustrating an example in which an adhesive outflow barrier portion is formed by a dropping method using a nozzle.

16 is a plan view showing an example of an adhesive outflow barrier portion formed by a dropping method using a nozzle in FIG.

FIG. 17 is a diagram showing a state in which an adhesive outflow barrier is to be formed with a substance having poor wettability with respect to the first substrate and the second substrate.

FIG. 18 is a plan view showing an example of an adhesive outflow barrier formed by the poorly wettable substance of FIG. 17;

[Explanation of symbols]

100 ... disk-shaped information recording medium, 110 ...
Adhesive, 400 ... adhesive outflow barrier, 401 ...
Projecting portion, 402: air release portion, D1: first substrate, D2: second substrate, 120A: first center hole, 120B: second center hole

Claims (11)

[Claims] 1. A first disk-shaped substrate having a first center hole and an information recording portion formed around the first center hole, and an information recording formed around the second center hole and the second center hole. And a disk-shaped second substrate that is bonded to the second center hole and the first substrate while rotating together with the first substrate by using an adhesive while aligning the position of the first center hole of the first substrate. In the vicinity of the first center hole of one substrate and the second center hole of the second substrate, an adhesive outflow barrier portion for preventing the adhesive from flowing to the first center hole and the second center hole is provided. An information recording medium characterized by being recorded. 2. The adhesive outflow barrier portion is formed of a photocurable resin, and the barrier height of the adhesive outflow barrier portion is set within a predetermined thickness of the adhesive when the information recording medium is obtained. The information recording medium according to claim 1, wherein 3. The information recording medium according to claim 1, wherein the adhesive outflow barrier portion is formed of a substance having low wettability with respect to the adhesive. 4. A first disc-shaped substrate having a first center hole and an information recording portion formed around the first center hole, and an information recording formed around the second center hole and the second center hole. An adhesive outflow barrier portion for preventing the adhesive from flowing toward the first center hole and the second center hole near the first center hole and the second center hole in the disk-shaped second substrate having the portion. Forming an adhesive outflow barrier portion to be formed; and bonding the first substrate and the second substrate while rotating using an adhesive while aligning the positions of the first center hole and the second center hole. A method for manufacturing an information recording medium, comprising: 5. An adhesive outflow barrier portion is formed of a photocurable resin, and a barrier height of the adhesive outflow barrier portion is set within a predetermined adhesive thickness when an information recording medium is obtained. The method for manufacturing an information recording medium according to claim 4, wherein: 6. An adhesive outflow barrier portion includes a first barrier portion formed near a first center hole of the first substrate and a second barrier portion formed near a second center hole of the second substrate. The method for manufacturing an information recording medium according to claim 5, comprising: 7. The method for manufacturing an information recording medium according to claim 6, wherein each of the first barrier portion and the second barrier portion has a protrusion and an air release portion between the protrusions. 8. The method for manufacturing an information recording medium according to claim 5, wherein the adhesive outflow barrier portion is made of a photocurable resin applied by a screen printing method. 9. The method for manufacturing an information recording medium according to claim 5, wherein the adhesive outflow barrier portion is made of a photocurable resin dropped by a nozzle. 10. The method for manufacturing an information recording medium according to claim 4, wherein the adhesive outflow barrier portion is formed of a substance having low wettability with respect to the adhesive. 11. The information recording medium according to claim 10, wherein the adhesive outflow barrier is made of oil.